2 Corinthians 4:16

In view of the reasons just sited, the apostle restated that he did not lose heart (cf. 2 Corinthians 4:1). However, Paul’s sufferings, while not fatal, were destroying his body. Nevertheless even this did not discourage him for, even though physically he was decaying, spiritually he was still developing (cf. Ephesians 3:16). In this verse Paul resumed the thought he began in 2 Corinthians 4:1.

"We are, in fact, on the threshold of one of the most important eschatological passages of the New Testament." [Note: Hughes, p. 152.]